Messages in this thread Patch in this message | | | From | John Ogness <> | Subject | [PATCH printk v1 04/13] printk: get caller_id/timestamp after migration disable | Date | Mon, 7 Feb 2022 20:49:14 +0106 |
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Currently the local CPU timestamp and caller_id for the record are collected while migration is enabled. Since this information is CPU-specific, it should be collected with migration disabled.
Migration is disabled immediately after collecting this information anyway, so just move the information collection to after the migration disabling.
Signed-off-by: John Ogness <john.ogness@linutronix.de> --- kernel/printk/printk.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index b346e60e9e51..206405f349d0 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -2017,7 +2017,7 @@ static inline void printk_delay(void) static inline u32 printk_caller_id(void) { return in_task() ? task_pid_nr(current) : - 0x80000000 + raw_smp_processor_id(); + 0x80000000 + smp_processor_id(); } /** @@ -2099,7 +2099,6 @@ int vprintk_store(int facility, int level, const struct dev_printk_info *dev_info, const char *fmt, va_list args) { - const u32 caller_id = printk_caller_id(); struct prb_reserved_entry e; enum printk_info_flags flags = 0; struct printk_record r; @@ -2109,10 +2108,14 @@ int vprintk_store(int facility, int level, u8 *recursion_ptr; u16 reserve_size; va_list args2; + u32 caller_id; u16 text_len; int ret = 0; u64 ts_nsec; + if (!printk_enter_irqsave(recursion_ptr, irqflags)) + return 0; + /* * Since the duration of printk() can vary depending on the message * and state of the ringbuffer, grab the timestamp now so that it is @@ -2121,8 +2124,7 @@ int vprintk_store(int facility, int level, */ ts_nsec = local_clock(); - if (!printk_enter_irqsave(recursion_ptr, irqflags)) - return 0; + caller_id = printk_caller_id(); /* * The sprintf needs to come first since the syslog prefix might be -- 2.30.2
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